Method for producing compound fertilizer by high tower granulating

A high-tower granulation and granule compounding technology, which is applied in the direction of urea compound fertilizer, fertilizer form, fertilizer mixture, etc., can solve the problems of increased stirring and granulator load, high granulation temperature, easy to block nozzles, etc., to improve the product quality, achieve low temperature operation, and good operating environment

Active Publication Date: 2007-03-28
拉多美科技集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. High reaction temperature leads to nitrogen loss and poor operating environment
[0005] 2. The degree of polymerization of monoammonium phosphate is large, the viscosity of slurry is high, the load of stirring and granulator is increased, and the power consumption is large
[0006] 3. The viscosity of the slurry is high, it is easy to block the nozzle, and the product has many irregular particles
[0007] 4. The reaction temperature is high, the contact time is long, the foam is generated, and it is easy to be boiled
[0008] 5. The granulation temperature is high, the pro

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 20kg of flux-modified ammonium nitrate and 330kg of urea into the melting tank, melt the urea at a temperature of 120°C (the melting point of urea is 132.7°C), and the melted urea naturally flows into the first-stage mixing tank. In the first stage mixing tank, adding temperature is potassium chloride 240kg and limestone powder 310kg at normal temperature again, mixes, and the temperature that obtains molten material is 105 ℃, makes it flow into the second stage mixing tank naturally. Then add 100 kg of monoammonium phosphate at normal temperature into the second-stage mixing tank, and the mixing time is 3 minutes, so that the temperature of the mixed molten slurry is about 98°C. The adjustable differential two-speed rotary granulation nozzle sprays into the granulation tower, and the granulation is completed under natural ventilation and cooling. The prepared containing N16.82%, P 2 o 5 5.08%, K 2 O 14.40%, all indicators are in line with GB15063-2001, a compou...

Embodiment 2

[0036] Add flux modified ammonium nitrate and magnesium sulfate heptahydrate 35kg and urea 360kg altogether by 1:1 (weight ratio) in melting tank, at temperature 125 ℃, urea is melted, and the urea after melting flows into the first stage mixing tank naturally. In the first stage mixing tank, adding temperature is potassium chloride 370kg and limestone powder 125kg and return material at normal temperature, mixes, and the temperature that obtains molten material is 115 ℃, makes it flow into the second stage mixing tank naturally. Then add 110 kg of monoammonium phosphate at normal temperature into the second-stage mixing tank, and the mixing time is 3 minutes to obtain a temperature of about 105°C for the mixed molten slurry. The adjustable differential two-speed rotary granulation nozzle sprays into the granulation tower, and the granulation is completed under natural ventilation and cooling. The prepared N18.22%, P 2 o 5 5.57%, K 2 O 22.20%, all indicators are consistent...

Embodiment 3

[0038] Add flux magnesium sulfate heptahydrate and borax by 1:1 (weight ratio) altogether 30kg and urea 330kg in melting tank, at temperature 123 ℃, urea is melted, and the urea after melting flows into the first stage mixing tank naturally. In the first stage mixing tank, adding temperature is potassium chloride 340kg and dolomite powder 200kg and return material at normal temperature again, mixes, and the temperature that obtains molten material is 110 ℃, makes it flow into the second stage mixing tank naturally. Then add 100 kg of monoammonium phosphate at normal temperature into the second-stage mixing tank, and the mixing time is 3 minutes, so that the temperature of the mixed molten slurry is about 95°C. The adjustable differential two-speed rotary granulation nozzle sprays into the granulation tower, and the granulation is completed under natural ventilation and cooling. The prepared N 16.50%, P 2 o 5 5.0%, K 2 O 20.40%, all indicators are consistent with GB15063-20...

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PUM

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Abstract

The invention discloses a method for producing urea-base grain compound fertilizer by high-tower prilling, comprising pulping and prilling, where the pulping adopts three-step series continuous gradual cooling pulping method, comprising the steps of: adding fluxing agent and urea in a melting tank, melting the urea at low temperature and making the urea melt flow into the first stage mixing tank; in the first stage mixing tank, adding unreactable raw materials into the urea melt, and making the mixed melt flow into the second stage mixing tank; in the second stage mixing tank, adding in ammium phosphate and mixing for less than 4 min, and obtaining mixed melted pulp; spraying the mixed melted pulp through the double-speed rotating prilling nozzle of the high tower into a prilling tower to complete prilling. And it has advantages of low temperature operation, low energy consumption, low loss, good pulp fluidity, good operating environment. And the produced compound fertilizer grains are round, less broken and uniform.

Description

technical field [0001] The invention relates to a production method of granular compound fertilizers, in particular to an improved high-tower granulation method for producing urea-based granular compound fertilizers. Background technique [0002] At present, with the promotion and application of high-tower granulation technology, the production of compound fertilizer has jumped to a new level. Such as the Chinese patent, the patent number is CN03139601.1, which discloses a method and equipment for producing granular compound fertilizer by high-tower granulation. The urea-based compound fertilizer produced by high-tower granulation technology is popular among users because of its advantages of uniform nutrition, good water solubility, wide application range, and performance far superior to other types of fertilizers. The key technology of the compound fertilizer tower production is the pulping process, the slurry is too thick not only cannot flow in the pipeline, but also ca...

Claims

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Application Information

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IPC IPC(8): C05G1/00C05G5/00C05C9/00
Inventor 王晓春罗冬贵
Owner 拉多美科技集团股份有限公司
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